4 gauge red tinned wire per ft

Ancor 113510 Marine Grade® Tinned Copper Battery Cable, #4 AWG, Red

Tinned copper stranding for maximum protection against corrosion, electrolysis and fatigue due to vibration and flexing. Rated at 600 volts and 105°C, the heavy duty insulation is resistant to heat and abrasion. Exceeds all UL 1426, US Coast Guard Charter Boat and ABYC standards.